Substantial resistance is built up after 8 days from the stuff I've read. Yeah immunity level is not great, but look at mortality in the studies.
AFAIK nobody that got even a single dose ended up in the hospital. That's huge if true. That means hospitizations will plummet well before everyone is through their second dose.
I dug deep for this lol... It looks like somebody ballparked it from a graph, I read it in a news story I can't find. It looks like COVID incidence among study participants comes to a screeching halt somewhere around 8-12 days after first dose
See this graph
> Cumulative Incidence Curves for the First COVID-19 Occurrence After Dose 1, Dose 1
All-Available Efficacy Population
Also keep in mind this graph is probably based on COVID diagnosis date. Since it's unrealistic to test positive the day you contract COVID, I think it's reasonable to say it might even be effective from day 3-5 on
They allegedly have partial immunity after the first dose (how partial i have no idea, and it might fade really quickly if you don't get the second), but its possible its enough to have some effect if enough of the right populations have the first dose.
AFAIK nobody that got even a single dose ended up in the hospital. That's huge if true. That means hospitizations will plummet well before everyone is through their second dose.